The impact of hands-free message reception/response on driving task performance

Area of Science:

• Human Factors
• Cognitive Psychology
• Transportation Safety

Background:

• Driver distraction is a major cause of road accidents.
• Audible messages in vehicles can potentially divert driver attention.
• Understanding the cognitive load imposed by auditory stimuli is crucial for road safety.

Purpose of the Study:

• To investigate the impact of audible messages on driver decision-making performance.
• To assess how driving complexity and road conditions influence this impact.
• To quantify decrements in driver performance due to auditory tasks.

Main Methods:

• Conducted closed-course driving experiments with 41 participants (aged 19-70).
• Assigned drivers to increasingly challenging tasks with and without audible messages.
• Measured driver/vehicle response characteristics and decision-making performance.

Main Results:

• Audible messages significantly impaired driver decision-making, particularly in complex maneuvers like weaving and left-turning.
• The negative impact on decision-making was more pronounced during left-turn tasks.
• Adverse pavement conditions exacerbated performance decrements caused by the message task.

Conclusions:

• Audible in-car messages pose a significant risk to driver decision-making, especially during complex driving situations.
• The presence of auditory tasks increases the likelihood of driving errors.
• Road safety interventions should consider the detrimental effects of audible distractions, particularly under challenging environmental conditions.